Request InfoTesta Analytical Solutions eKBERLIN, Germany, Dec. 28, 2018 — The AYE Differential Refractometer from Testa Analytical Solutions eK is a high-performance instrument for chromatographic measurements. In static mode, the specific refractive index increment (dn/dc) of dissolved samples can be easily and precisely determined in just a few minutes. The specific refractive index increment is a critical parameter required to determine absolute molecular weight using static light scattering (SLS) detectors because a relatively small error in dn/dc determination will lead to twice the error in calculating molecular weights. 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